G8T Diesel Engines — General Information The inline four-cylinder, 12-valve diesel engine is mounted transversely at the front of the vehicle. The cylinder block is made of cast iron, and the cylinder head is made of aluminum alloy. The timing mechanism is...
G8T diesel engines — technical data Engine type - G8T714, G8T716 Cylinder diameter, mm - 87 Piston stroke, mm - 92 Cylinder volume, cm 3 - 2188 Compression ratio - 22:1 Maximum power: - CEE - 83 kW at 4500 min -1 - DIN - 115 hp at 4500 min -1 Maximum...
Engine repair Attention Removing the injectors does not require first removing the intake manifold, provided that the Mot. key is used. 1383 Renault for removing high pressure pipes with 27 mm long socket or Renault Mot. 997 for...
Valve clearances Due to the use of hydraulic pushers (valve clearance compensators) no need to check or adjust valve clearances. The only check is to monitor the condition of the surfaces of the gap compensators and their sliding in the...
Cleaning the fuel system Pic. 3.1. Fine fuel filter: 1 - fuel supply pipeline; 2 - fuel booster pump; 3 - air removal bolt; 4 - fuel return pipeline; 5 - water drain bolt; 6 - fine fuel filter housing; 7 - electrical heater connector; 8 -...
Replacing the fine fuel filter The fuel filter is equipped with an electric heater and a thermal switch, which turns on the heater depending on the fuel temperature. Heater power is approximately 150 W The electric heater turns on at a fuel...
High pressure fuel pump General description To comply with Euro 96 standards, ESPACE Turbo Diesel is equipped with a T.P.R - EGR system (pre- and post-heating time delay and exhaust gas recirculation control). High pressure fuel pump...
Adjusting the injection timing of the high pressure fuel pump Raise the car on a lift so that the wheels hang freely in the air. Disconnect the cable from the negative terminal of the battery. Remove the right front wheel, the plastic mud guard protecting the engine and the right...
Nozzle body Removal The injector assembly with sprayer is wrapped in the cylinder head. Removing the injectors does not require removing the intake manifold. Disconnect the cable from the negative terminal of the battery. Using a...
Checking the injector Pic. 3.14. Location of the injector and glow plug in the pre-combustion chamber 1 - nozzle; 2 - nozzle assembly with sprayer; 3 - sealing ring of the injector in the cylinder head; 4 - flameproof washer; 5 - protective...
Glow plugs The engine is equipped with ultra-fast glow plugs. The time the heating element reaches a temperature of 850°C is within 3-7 seconds, depending on the characteristics of the candle. The spark plugs are equipped with a...
Adjusting the high pressure fuel pump Attention. It is strongly recommended to follow the sequence of adjustments. Adjusting idle speed and idle return Note. These adjustments must be made on a hot engine after turning on the radiator fan twice. Make sure...
Replacing the load potentiometer Removal Turn off the ignition. Disconnect the electrical connector from the load potentiometer. Remove the two screws and load potentiometer. Installation Install a new potentiometer. Observe the installation position...
Engine management system Electrical power supply for G8T 714 motor From the ignition switch, voltage is supplied to contact A1 of the engine control unit. This circuit is protected by a 30 A fuse (F38). located inside the car. The relay power...
Engine preheating and postheating control Pic. 3.20. Location of various engine management system components and wiring harnesses in the engine compartment with the G8T 714 engine: 1 - engine control unit; 2 - engine warm-up control unit; 3 - inertial shock...
KSB injection timing advance system The solenoid valve for adjusting the injection timing of a cold engine KSB is controlled by the engine control unit. It is activated by applying voltage for a minimum of 8 seconds after start-up, then it is activated or...
Load metering system ALFB Load dependency (LFB) aims to convert pressure into a voltage signal during deceleration and low load in order to reduce fuel consumption Solenoid valve (AFLB), controlled by the engine control unit, is a device that...
Accelerated idling control The fast idle function is controlled by an electronic unit via a pneumatic capsule control solenoid valve. This function only applies to vehicles equipped with air conditioning. When the ignition is turned on, the fast...
Exhaust gas recirculation system (EGR) The EGR function is controlled by the electronic unit through a solenoid valve controlled according to the law of cyclic opening. The EGR valve is pneumatically controlled. Its opening is a function of the control...
Timing belt drive of the gas distribution mechanism Removal When removing the timing belt, the following special tools must be used: belt tension checker Mot 1273; centering fork of the pendulum suspension travel limiter Mot. 1289-02; top dead center lock (TDC) Mot....
Tensioning roller of the timing belt drive Removal Place the car on a two-post lift and lift the front wheels. Disconnect the cable from the negative terminal of the battery. Remove: - right front wheel; - protective shields under the engine; - protective fender...
Auxiliary equipment drive belt Vehicles with air conditioning system Pic. 3.34. Location of bolts securing the corrugated boot of the drive shaft to the differential flange Pic. 3.35. Installation of accessories Mot. 1368, Mot. 1369 and Mot. 1376 for...
Removal and installation of G8T TURBO engine — RK1 Removal Removal - installation is carried out on a two- or four-post lift, without removing: - front subframe; - bumpers; - front body panel; - a set of cooling system elements. Place the vehicle on a two-post lift...
Air charging — turbocharger When carrying out work on the turbocharger, the following recommendations must be carefully observed: Before unscrewing parts, thoroughly clean the area where they are connected; place the removed parts on a clean,...
Checking boost pressure Dynamic check Install a T-shaped adapter with a pressure gauge on the pneumatic channel of the air flow corrector of the air charging system. Place the pressure gauge inside the car. Carry out a road test under the...
Pressure regulator Removal Removing the pressure regulator requires removing the intake manifold as well as the turbocharger thermal shield. Remove the intake manifold and heat shield. Pic. 3.45. Location of the manifold thermal...
Intake manifold Removal Disconnect the cable from the negative terminal of the battery. Place the car on a lift and remove the front wheels. Disconnect, without removing, the oil cooler from the engine cooling system radiator. Be sure...
Exhaust manifold with turbocharger Pic. 3.47. Location of the intake manifold mounting threaded rods Removing the exhaust manifold, turbocharger or related components requires first removing the power unit. When installing, it is necessary to observe the...
Cylinder head Removal Removal of the cylinder head must be carried out with the engine removed from the vehicle. Remove the cap from the oil filler neck. Remove the timing belt of the valve timing mechanism. Remove the bolt securing...
Sequence of tightening the cylinder head bolts Pre-tightening Tighten all bolts to a torque of 20 Nm, then tighten to an angle in accordance with the data given in the table. Bolt number Corner.±2° Bolt length, mm 1. 5, 9, 13, 17 215 185 with washer 2. 6. 10, 14, 18...
Cylinder head repair Disassembly Attention. When disassembling the cylinder head, make sure that all parts can subsequently be installed in their original places. Remove the glow plugs. Remove the exhaust manifold and turbocharger. Using...
Engine repair — disassembly, inspection and assembly Disassembly Remove the power unit from the vehicle. Remove the cylinder head. Disconnect the electrical connectors from the starter, remove the bolts and remove the starter. Remove the bolts securing the gearbox to the...
Lubrication system — general information Cars use a pressure lubrication system for the engine. Oil from the oil pan is supplied under pressure by an oil pump through a strainer and a fine filter. The oil pump is driven by a chain from the crankshaft. The...
Oil pump Pic. 3.70. Location of oil pump mounting bolts Removal Disconnect the cable from the negative terminal of the battery. Remove the plastic engine protection cover Drain the engine oil. Remove the oil pan Unscrew the...
Checking oil pressure Disconnect the cable from the negative terminal of the battery. Remove the power steering hydraulic fluid reservoir. Unscrew the high pressure line from the fuel injector of the first cylinder. Unscrew the oil pressure...
Cooling system The closed cooling system includes a water pump, cross-flow radiator, radiator fan with electrical wire, thermostat, heater core, hoses and sensors. The radiator fan with electric wire turns on when the contact...
Cooling liquid Aluminum radiators require the use of appropriate coolant. The coolant GLACEOL type D, offered by the Renault network, meets the technical requirements of the Research Center, in particular: neutrality when interacting...
Checking the tightness of the cooling system See the corresponding description in the section « F3R petrol engines ». Pic. 3.73. Coolant circulation diagram in the engine cooling system: 1 - right interior heating radiator; 2 - left interior heating radiator; 3 -...
Water pump Removal Raise the car on a lift so that the wheels hang freely in the air. Disconnect the cable from the negative terminal of the battery. Remove the right front wheel, the plastic mud guard protecting the engine and...
Coolant drain Pic. 3.75. Cooling system elements: 1 - expansion tank; 2 - housing for coolant; 3 - coolant temperature sensor; 4 - coolant temperature sensor for the indicator in the instrument cluster; 5 - water pump; 6 -...
Filling the cooling system and removing air There is no radiator for the interior heating system in the faucet cooling system. The coolant is constantly circulated through the radiators of the heating system, which thus participate in cooling the engine. Filling...
Set of cooling system elements including radiator Removal Removing the cooling system kit and radiator for the G8T engine is similar to the procedure for the F3R engine, except for the following differences: - to lower the set of cooling system elements on a car with a...
Exhaust gas exhaust system Pic. 3.78. Connection of the exhaust pipe of vehicles with G8T engines: 1 - hairpin; 2 - ring Hairpins (1, fig. 3.78) The exhaust pipes of vehicles with G8T engines have stops that determine the tension of the springs,...
Noise in the exhaust system To determine the source of the noise, you should conduct a road test of the vehicle. Then you should reproduce the malfunction with the car stationary. To do this, it is necessary to repeatedly and sharply change the...